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|
{-# LANGUAGE PackageImports #-}
module Propellor.PropAccum
( host
, props
, PropAccum(..)
, (!)
, PropList
, propigateContainer
) where
import Data.Monoid
import Propellor.Types
import Propellor.Property
-- | Starts accumulating the properties of a Host.
--
-- > host "example.com"
-- > & someproperty
-- > ! oldproperty
-- > & otherproperty
host :: HostName -> Host
host hn = Host hn [] mempty
-- | Starts accumulating a list of properties.
--
-- > propertyList "foo" $ props
-- > & someproperty
-- > ! oldproperty
-- > & otherproperty
props :: PropList
props = PropList []
-- | Something that can accumulate properties.
class PropAccum h where
-- | Adds a property.
--
-- Can add Properties and RevertableProperties
(&) :: IsProp p => h -> p -> h
-- | Like (&), but adds the property at the front of the list.
(&^) :: IsProp p => h -> p -> h
getProperties :: h -> [Property HasInfo]
instance PropAccum Host where
(Host hn ps is) & p = Host hn (ps ++ [toProp p])
(is <> getInfoRecursive p)
(Host hn ps is) &^ p = Host hn ([toProp p] ++ ps)
(getInfoRecursive p <> is)
getProperties = hostProperties
data PropList = PropList [Property HasInfo]
instance PropAccum PropList where
PropList l & p = PropList (toProp p : l)
PropList l &^ p = PropList (l ++ [toProp p])
getProperties (PropList l) = reverse l
-- | Adds a property in reverted form.
(!) :: PropAccum h => h -> RevertableProperty -> h
h ! p = h & revert p
infixl 1 &^
infixl 1 &
infixl 1 !
-- | Adjust the provided Property, adding to its
-- propertyChidren the properties of the provided container.
--
-- The Info of the propertyChildren is adjusted to only include
-- info that should be propigated out to the Property.
--
-- DNS Info is propigated, so that eg, aliases of a PropAccum
-- are reflected in the dns for the host where it runs.
--
-- PrivData Info is propigated, so that properties used inside a
-- PropAccum will have the necessary PrivData available.
propigateContainer
:: (PropAccum container)
=> container
-> Property HasInfo
-> Property HasInfo
propigateContainer c prop = infoProperty
(propertyDesc prop)
(propertySatisfy prop)
(propertyInfo prop)
(propertyChildren prop ++ hostprops)
where
hostprops = map go $ getProperties c
go p =
let i = propertyInfo p
i' = mempty
{ _dns = _dns i
, _privData = _privData i
}
cs = map go (propertyChildren p)
in infoProperty (propertyDesc p) (propertySatisfy p) i' cs
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